diff --git a/pkgs/development/python-modules/fontmake/default.nix b/pkgs/development/python-modules/fontmake/default.nix
index 5572181e7cf6..37c4a52a1237 100644
--- a/pkgs/development/python-modules/fontmake/default.nix
+++ b/pkgs/development/python-modules/fontmake/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  fetchpatch2,
   pytestCheckHook,
   fontmath,
   fonttools,
@@ -26,6 +27,16 @@ buildPythonPackage rec {
     hash = "sha256-ZlK8QyZ5cIEphFiZXMV/Z5pL9H62X2UwLBtpwLGpUMQ=";
   };
 
+  patches = [
+    # Update to FontTools 4.55 and glyphsLib 6.9.5
+    # https://github.com/googlefonts/fontmake/pull/1133
+    (fetchpatch2 {
+      url = "https://github.com/googlefonts/fontmake/commit/ca96d25faa67638930ddc7f9bd1ab218a76caf22.patch";
+      includes = [ "tests/test_main.py" ];
+      hash = "sha256-vz+KeWiGCpUdX5HaXDdyyUCbuMkIylB364j6cD7xR1E=";
+    })
+  ];
+
   build-system = [
     setuptools
     setuptools-scm